This is a Custom Hard Case for Kowa TV 37.5mm f/1.1 Fast Prime Cine Lens in C-Mount.

The case has two lids - one is a solid lid, that can be attached to the case body, by itself.  The other is a two sided piece with a grid on one end so that desiccant can be included between the case body and the solid lid to protect the unit from moisture.
 
Lens and desiccant not included!

3D printed in ASA on a high-end FDM 3D Printer.

Excellent new condition - Printed in ASA, which is heat, weather and UV resistant.